Very odd, found my issue.
I was browse http://whatsnew (internal) and it would render differently than using FQDN.
Turns out it has something to do with IE compatibility mode for Display intranet sites in Compatibility View setting. I had to add this line below in the <head> (keep in mind that it has to be near the top of the <head>.
It basically forces your IE to use the newest rendering mode.
<meta http-equiv="X-UA-Compatible" content="IE=edge" />